Fig. 3
From: Chest wall loading in the ICU: pushes, weights, and positions
Differential effects of regional chest wall loading. Selective compression of the supradiaphragmatic compartment (left panel) is expected to result in relatively minimal loss (darker blue) of resting lung volume (functional residual capacity, FRC) or change in intra-abdominal pressure (IAP). In contrast, selective compression of the infradiaphragmatic compartment (right panel) increases IAP and displaces the diaphragm cephalad (dashed arrows), resulting in comparatively greater loss (darker blue) of resting lung volume (lighter blue). In the setting of widespread end-tidal hyperinflation with minimal recruitable lung tissue, forced lung volume reduction through either method would be expected to elicit mechanical paradox